CVE-2019-17426: Mongoosejs Mongoose

Critical severity, CVSS 9.1. EPSS: 1.7% chance of exploitation in the next 30 days.

Automattic Mongoose through 5.7.4 allows attackers to bypass access control (in some applications) because any query object with a _bsontype attribute is ignored. For example, adding "_bsontype":"a" can sometimes interfere with a query filter. NOTE: this CVE is about Mongoose's failure to work around this _bsontype special case that exists in older versions of the bson parser (aka the mongodb/js-bson project).

Affected products

• Mongoosejs Mongoose: up to and including 5.7.4

Published 2019-10-10. Last modified 2026-06-17.